On 03/13/2015 03:55 PM, craig wrote: > Thanks also to John. from your suggested testing it is a 3 > phase induction induction. The air line is for cooling > 40psi filtered air needed at higher RPM. I have a Westwind air bearing spindle motor. it has very low inductance, so I had to add large series inductors to be able to run it on a standard VFD. That will go to 400 Hz, so I am limited to about 24K RPM, which is still useful. My particular motor has to be set up for 80 V at 400 Hz, so you need a VFD that is completely programmable. Note that these high-speed, low voltage motors draw more current than a typical 240 V motor, so you might want to be sure the VFD you select has adequate current capability.
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